Cyclerosis
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I use a maintenance lift with the front wheel strapped in a wheel chock and the rear lifted by a bottle jack.
This gives you the full range of deflection. In this case, the correct 1-3/8".
I would opt for the belt if given a choice. Where I work, we have 100+ horse power motors that run 24/7 for multiple years.
There is no suspension compression on mine with the bike on the side stand. If I straighten the bike unladen, I get about 1/2 inch. So, side stand, center stand, or maintenance lift should all be the same.
I am mostly sure it's strait...
But the noise is not tied to engine RPM. If I pull in the clutch at 65mph, the noise stays constant until the bike slows/stops.
It sounds like a gear whining noise (so likely chain/sprockets)